[PATCH ath-next] wifi: ath12k: Add support to set per-radio RTS threshold

[Roopni Devanathan]

Currently, command to set RTS threshold makes changes to the threshold of
all radios in the multi-radio wiphy. But each radio in a multi-radio wiphy
can have different RTS threshold requirements.

To support this requirement, use the index of radio for which the RTS
threshold needs to be changed from mac80211 - radio_idx. Based on the value
passed, set the RTS threshold value for the corresponding radios. Following
are the possible values of radio_idx and the corresponding behavior in
multi-radio wiphys:
 1. radio_idx is -1: consider RTS threshold as a global parameter, i.e.,
    make changes to all the radios in a wiphy. If setting RTS threshold
    fails for any radio, then the previous RTS threshold values of
    respective radios will be restored.
 2. radio_idx denotes a specific radio: make changes in RTS threshold to
    that radio alone.
 3. radio_idx is any other number: report it as an invalid number.

In case of single-radio wiphys, continue with the existing behavior, i.e.,
set the passed RTS threshold value to the radio present.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Roopni Devanathan <quic_rdevanat at quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.h |  3 +-
 drivers/net/wireless/ath/ath12k/mac.c  | 50 ++++++++++++++++++++++----
 2 files changed, 45 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 519f826f56c8..da7e99f2ca0b 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: BSD-3-Clause-Clear */
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
  */
 
 #ifndef ATH12K_CORE_H
@@ -730,6 +730,7 @@ struct ath12k {
 	u32 txpower_scale;
 	u32 power_scale;
 	u32 chan_tx_pwr;
+	u32 rts_threshold;
 	u32 num_stations;
 	u32 max_num_stations;
 
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index bd1ec3b2c084..c0e0423464e3 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: BSD-3-Clause-Clear
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
  */
 
 #include <net/mac80211.h>
@@ -9848,6 +9848,7 @@ int ath12k_mac_vdev_create(struct ath12k *ar, struct ath12k_link_vif *arvif)
 
 	param_id = WMI_VDEV_PARAM_RTS_THRESHOLD;
 	param_value = hw->wiphy->rts_threshold;
+	ar->rts_threshold = param_value;
 	ret = ath12k_wmi_vdev_set_param_cmd(ar, arvif->vdev_id,
 					    param_id, param_value);
 	if (ret) {
@@ -11675,16 +11676,32 @@ static int ath12k_mac_op_set_rts_threshold(struct ieee80211_hw *hw,
 					   int radio_idx, u32 value)
 {
 	struct ath12k_hw *ah = ath12k_hw_to_ah(hw);
+	struct wiphy *wiphy = hw->wiphy;
 	struct ath12k *ar;
-	int param_id = WMI_VDEV_PARAM_RTS_THRESHOLD, ret = 0, i;
+	int param_id = WMI_VDEV_PARAM_RTS_THRESHOLD;
+	int ret = 0, ret_err, i;
 
 	lockdep_assert_wiphy(hw->wiphy);
 
-	/* Currently we set the rts threshold value to all the vifs across
-	 * all radios of the single wiphy.
-	 * TODO Once support for vif specific RTS threshold in mac80211 is
-	 * available, ath12k can make use of it.
-	 */
+	if (radio_idx >= wiphy->n_radio || radio_idx < -1)
+		return -EINVAL;
+
+	if (radio_idx != -1) {
+		/* Update RTS threshold in specified radio */
+		ar = ath12k_ah_to_ar(ah, radio_idx);
+		ret = ath12k_set_vdev_param_to_all_vifs(ar, param_id, value);
+		if (ret) {
+			ath12k_warn(ar->ab,
+				    "failed to set RTS config for all vdevs of pdev %d",
+				    ar->pdev->pdev_id);
+			return ret;
+		}
+
+		ar->rts_threshold = value;
+		return 0;
+	}
+
+	/* Radio_index passed is -1, so set RTS threshold for all radios. */
 	for_each_ar(ah, ar, i) {
 		ret = ath12k_set_vdev_param_to_all_vifs(ar, param_id, value);
 		if (ret) {
@@ -11693,6 +11710,25 @@ static int ath12k_mac_op_set_rts_threshold(struct ieee80211_hw *hw,
 			break;
 		}
 	}
+	if (!ret) {
+		/* Setting new RTS threshold for vdevs of all radios passed, so update
+		 * the RTS threshold value for all radios
+		 */
+		for_each_ar(ah, ar, i)
+			ar->rts_threshold = value;
+		return 0;
+	}
+
+	/* RTS threshold config failed, revert to the previous RTS threshold */
+	for (i = i - 1; i >= 0; i--) {
+		ar = ath12k_ah_to_ar(ah, i);
+		ret_err = ath12k_set_vdev_param_to_all_vifs(ar, param_id,
+							    ar->rts_threshold);
+		if (ret_err)
+			ath12k_warn(ar->ab,
+				    "failed to restore RTS threshold for all vdevs of pdev %d",
+				    ar->pdev->pdev_id);
+	}
 
 	return ret;
 }

base-commit: 95bf875b89b48a95a82aca922eeaf19d52543028
-- 
2.25.1